The engine resource pages provide some background reading/theory about piston engines. We hope it will give our interested public a better insight and critical view when interpreting performance figures published by engine manufactures. 

Fuel consumption vs HP
   Specific Fuel Consumption
   Fuel efficiency
   Calculating power produced

ISA conditions & conversion
   International Standard Atmosphere (ISA) 
   Density Altitude
   Engine performance in reality
   The effect of a turbo normaliser
   Conclusion 

Measuring Power & Torque
   Defining power and torque
   Measuring torque with a dyno
   Measurement uncertainties
   Testing conditions
   Comparing engines